🧩 FKM+GF – Glass Fiber Reinforced Fluoroelastomer
(A high-performance composite combining extreme thermal resistance, dimensional stability, and high mechanical hardness. FKM+GF is a premium technical material used in seals, valves, and rigid gaskets exposed to oils, pressure, and high temperatures.)
🔹 What is FKM+GF
FKM+GF is an elite technical composite. At ReplastMD, we treat it as “reinforced Viton.” By introducing 10–30% glass fiber into the fluoroelastomer matrix, a significant increase in rigidity and abrasion resistance is achieved. It maintains the chemical inertness of standard FKM while preventing the “cold flow” or deformation typical of non-reinforced rubbers under heavy mechanical loads.
🔧 Composition & Properties
- Polymer Base: FKM (Fluorocarbon Rubber).
- Reinforcement: E-glass fiber (10–30%).
- Density: ~ 1.85 – 2.00 g/cm³.
- Operating Range: Up to +250 °C.
- Chemical Resistance: Exceptional (fuels, oils, high-pressure steam).
- Visuals: Rigidized, dense rubber; matte black or dark grey.
🚗 Where it is used in the automotive industry
| Component | Example parts | Observations |
| Rigid Sealing Gaskets | Toyota, VW, Renault | Exposed to oils/steam at 200 °C + |
| Valve Caps / Rings | BMW, Ford | Excellent compression and tension resistance |
| Hybrid Components | Peugeot, Nissan | Used in metal-plastic-FKM assemblies |
| Advanced Sealing | ReplastMD Internal | High-pressure technical repairs |
🔧 Welding and Bonding Methods
| Method | Optimal Temp | Observations |
| Hot Air | ✅ 250 – 280 °C | Surface activation only; strict control required |
| Chemical Bonding | ✅ Recommended | Specialized FKM/FLS adhesives (Loctite® FPM) |
| Extrusion | ❌ Not possible | Vulcanized material; cannot be extruded |
💡 ReplastMD Recommendation: For FKM+GF repairs or sealing, use fluoroelastomer-specific adhesives and controlled hot air for activation (~260 °C). The material provides exceptional resistance to fluids, heat, and pressure, making it ideal for advanced automotive sealing and rigid anti-oil covers.